U.S. Census
SLATE Magazine
By Christopher Beam|Posted Wednesday, May 27, 2009, at 6:40 PM ET
[...] Hispanic is an English word that originally referred to people from Spain and eventually expanded to include the populations of its colonies in South and Central America. Latino is a Spanish word—hence the feminine form Latina—that refers to people with roots in Latin America and generally excludes the Iberian Peninsula. For many, Hispanic has negative connotations because of its Eurocentrism. Others prefer it because it's gender-neutral. Latino, meanwhile, is perceived as a more authentic-sounding, Spanish-language alternative.
For years, Spanish-speaking people in the United States were identified according to their ancestral nationality. In the 1970 U.S. census, for example, people were asked whether they were Mexican, Puerto Rican, Cuban, Central or South American, or "other Spanish." (The question caused much confusion because many Americans from the middle or southern regions of the United States identified themselves as "Central or South American.") The word Hispanic was not used until the 1980 census, after the Office of Management and Budget imposed rules standardizing ethnicity statistics. (The change came after a federal committee on minority education complained about the lack of useful data.) In 1997, the OMB changed its classification to "Hispanic or Latino," explaining that "Hispanic is commonly used in the eastern portion of the United States, whereas Latino is commonly used in the western portion." [...]
Ultimately, there is no strict definition of Hispanic or Latino. The College Board, which administers the SAT, leaves it up to the student to self-identify. The U.S. Census Bureau makes no distinction between the two terms. It defines Hispanics and Latinos as "persons who trace their origin or descent to Mexico, Puerto Rico, Cuba, Spanish speaking Central and South America countries, and other Spanish cultures." But if someone from Brazil says he's Hispanic, the census doesn't say, No, you're not.
Thanks to Jeffrey Passel of Pew Hispanic Center, Ilan Stavans of Amherst College, and Brent Wilkes of the League of United Latin American Citizens.
source: http://www.slate.com/articles/news_and_politics/explainer/2009/05/is_hispanic_the_same_thing_as_latina.html